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Diffstat (limited to 'app/wlib/gtklib/font.c')
| -rw-r--r-- | app/wlib/gtklib/font.c | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/app/wlib/gtklib/font.c b/app/wlib/gtklib/font.c new file mode 100644 index 0000000..c54f7de --- /dev/null +++ b/app/wlib/gtklib/font.c @@ -0,0 +1,403 @@ +/** \file font.c + * Font selection and loading. + */ + +/* XTrkCad - Model Railroad CAD + * Copyright (C) 2005 Dave Bullis + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include <stdlib.h> +#ifdef HAVE_MALLOC_H +#include <malloc.h> +#endif + +#define GTK_DISABLE_SINGLE_INCLUDES +#define GDK_DISABLE_DEPRECATED +#define GTK_DISABLE_DEPRECATED +#define GSEAL_ENABLE + +#include <gtk/gtk.h> +#include <gdk/gdk.h> + +#include "wlib.h" +#include "gtkint.h" +#include "i18n.h" + +/* + * Macro for debug purposes. Possible debug macro values: + * + * 0 - no messages to console (use this value when building in release mode) + * 1 - send errors + * 2 - send details + * 3 - send more details + */ +#define WLIB_FONT_DEBUG 0 + +static gchar sampleText[] = "AbCdE0129!@$&()[]{}"; + +static GtkWidget *fontSelectionDialog; + + +/***************************************************************************** + * FONT HANDLERS + */ + +#define FW_MEDIUM (0) +#define FW_BOLD (1) +#define FS_REGULAR (0) +#define FS_ITALIC (1) + +/* absoluteFontSize was introduced to keep the font size information synchron + * between the Dt.size of ctext.c and it's drop list on the status bar and + * the font size coming from the gtk font dialog which is located in this file */ +int absoluteFontSize = 18; + +struct wFont_t { + PangoFontDescription *fontDescription; +}; + +static wFont_p standardFonts[F_HELV-F_TIMES+1][2][2]; +static wFont_p curFont = NULL; + +/** + * Callback for font selection dialog + * + * \param fontSelectionDialog IN dialog + * \param response IN response code from dialog + * \param data IN unused + * \return + */ + +static void fontSelectionDialogCallback(GtkFontSelectionDialog + *fontSelectionDialog, gint response, gpointer data) +{ + if (response == GTK_RESPONSE_APPLY || response == GTK_RESPONSE_OK) { + gchar *fontName; + + fontName = gtk_font_selection_dialog_get_font_name(fontSelectionDialog); + wPrefSetString("font", "name", fontName); + pango_font_description_free(curFont->fontDescription); + curFont->fontDescription = pango_font_description_from_string(fontName); + absoluteFontSize = (pango_font_description_get_size( + curFont->fontDescription))/PANGO_SCALE; +#if WLIB_FONT_DEBUG >= 2 + fprintf(stderr, "new font selection:\n"); + fprintf(stderr, " font name \"%s\"\n", fontName); + fprintf(stderr, " font size is %d\n", + pango_font_description_get_size(curFont->fontDescription)/PANGO_SCALE); + fprintf(stderr, " font size is absolute %d\n", + pango_font_description_get_size_is_absolute(curFont->fontDescription)); +#endif + g_free(fontName); + } + + if (response == GTK_RESPONSE_OK || response == GTK_RESPONSE_CANCEL) { + gtk_widget_hide(GTK_WIDGET(fontSelectionDialog)); + } +} + +static wBool_t fontInitted = FALSE; + +static wBool_t fontInit() +{ + const char *fontNames[] = { + "times 18", + "times italic 18", + "times bold 18", + "times bold italic 18", + "helvetica 18", + "helvetica oblique 18", + "helvetica bold 18", + "helvetica bold oblique 18", + }; + int s = 0; + int i, j, k; + + for (i = F_TIMES; i <= F_HELV; ++i) { + for (j = FW_MEDIUM; j <= FW_BOLD; ++j) { + for (k = FS_REGULAR; k <= FS_ITALIC; ++k) { + PangoFontDescription *fontDescription = pango_font_description_from_string( + fontNames[s++]); + wFont_p standardFont = (wFont_p) malloc(sizeof(struct wFont_t)); + standardFont->fontDescription = fontDescription; + standardFonts[i-F_TIMES][j][k] = standardFont; + } + } + } + + if (curFont == NULL) { + curFont = (wFont_p) malloc(sizeof(struct wFont_t)); + + if (curFont == NULL) { + return FALSE; + } + + const char *fontName = wPrefGetString("font", "name"); + curFont->fontDescription = pango_font_description_from_string( + fontName ? fontName : "helvetica 18"); + absoluteFontSize = (int) PANGO_PIXELS(pango_font_description_get_size( + curFont->fontDescription)); + } + + fontInitted = TRUE; + return TRUE; +} + + +static double fontFactor = 1.0; + +#define FONTSIZE_TO_PANGOSIZE(fs) ((gint) ((fs) * (fontFactor) + .5)) + +/** + * Create a Pango layout with a specified font and font size + * + * \param widget IN + * \param cairo IN cairo context + * \param fp IN font + * \param fs IN size + * \param s IN ??? + * \param width_p OUT width of layout + * \param height_p OUT height of layout + * \param ascent_p OUT ascent of layout + * \param descent_p OUT descent of layout + * \return the created Pango layout + */ + +PangoLayout *wlibFontCreatePangoLayout(GtkWidget *widget, + void *cairo, + wFont_p fp, + wFontSize_t fs, + const char *s, + int *width_p, + int *height_p, + int *ascent_p, + int *descent_p) +{ + if (!fontInitted) { + fontInit(); + } + + PangoLayout *layout = NULL; + gchar *utf8 = wlibConvertInput(s); + /* RPH -- pango_cairo_create_layout() is missing in CentOS 4.8. + CentOS 4.8 only has GTK 2.4.13 and Pango 1.6.0 and does not have + libpangocairo at all. + pango_cairo_create_layout() was introduced with Pango 1.10. */ +#if PANGO_VERSION_MAJOR >= 1 && PANGO_VERSION_MINOR >= 10 + + if (cairo != NULL) { + layout = pango_cairo_create_layout((cairo_t *) cairo); + pango_layout_set_text(layout, utf8, -1); + } else +#endif + layout = gtk_widget_create_pango_layout(widget, utf8); + + PangoFontDescription *fontDescription = (fp ? fp : curFont)->fontDescription; + PangoContext *context; + PangoFontMetrics *metrics; + /* set attributes */ + pango_font_description_set_size(fontDescription, + FONTSIZE_TO_PANGOSIZE(fs) * PANGO_SCALE); + pango_layout_set_font_description(layout, fontDescription); + /* get layout measures */ + pango_layout_get_pixel_size(layout, width_p, height_p); + context = gtk_widget_get_pango_context(widget); + metrics = pango_context_get_metrics(context, fontDescription, + pango_context_get_language(context)); + *ascent_p = PANGO_PIXELS(pango_font_metrics_get_ascent(metrics)); + *descent_p = PANGO_PIXELS(pango_font_metrics_get_descent(metrics)); + pango_font_metrics_unref(metrics); +#if WLIB_FONT_DEBUG >= 3 + fprintf(stderr, "font layout created:\n"); + fprintf(stderr, " widget: %p\n", widget); + //fprintf(stderr, " font description:%p\n", fp); + fprintf(stderr, " font size: %f\n", fs); + fprintf(stderr, " layout text: \"%s\" (utf8)\n", utf8); + fprintf(stderr, " layout width: %d\n", *width_p); + fprintf(stderr, " layout height: %d\n", *height_p); + fprintf(stderr, " layout ascent: %d (pixels)\n", *ascent_p); + fprintf(stderr, " layout descent: %d (pixels)\n", *descent_p); +#endif + return layout; +} + +/** + * Destroy a previously allocated Pango layout + * \return + */ + +void wlibFontDestroyPangoLayout(PangoLayout *layout) +{ + g_object_unref(G_OBJECT(layout)); +} + +/** + * Initialize font data + * \return + */ + +void wInitializeFonts() +{ + if (!fontInitted) { + fontInit(); + } +} + +/** + * Initialize and run the font dialog + * + * \param title IN dialog box title + * \return + */ + +void wSelectFont( + const char * title) +{ + if (!fontInitted) { + fontInit(); + } + + if (fontSelectionDialog == NULL) { + fontSelectionDialog = gtk_font_selection_dialog_new(_("Font Select")); + gtk_window_set_position(GTK_WINDOW(fontSelectionDialog), GTK_WIN_POS_MOUSE); + gtk_window_set_modal(GTK_WINDOW(fontSelectionDialog), TRUE); + gtk_font_selection_dialog_set_preview_text(GTK_FONT_SELECTION_DIALOG( + fontSelectionDialog), sampleText); + g_signal_connect(G_OBJECT(fontSelectionDialog), "response", + G_CALLBACK(fontSelectionDialogCallback), NULL); + g_signal_connect(G_OBJECT(fontSelectionDialog), "destroy", + G_CALLBACK(gtk_widget_destroyed), &fontSelectionDialog); + } + + gtk_window_set_title(GTK_WINDOW(fontSelectionDialog), title); + + if (curFont != NULL) { + gchar *fontName; + + /* the curFont description contains the latest font info + * which is depended on the current scale + * overwrite it with the absoluteFontSize */ + pango_font_description_set_size(curFont->fontDescription, + FONTSIZE_TO_PANGOSIZE(absoluteFontSize) * PANGO_SCALE); + fontName = pango_font_description_to_string(curFont->fontDescription); + gtk_font_selection_dialog_set_font_name(GTK_FONT_SELECTION_DIALOG( + fontSelectionDialog), fontName); + g_free(fontName); + } + + gtk_widget_show(fontSelectionDialog); +} + +/** + * Get the current font + * + * \return describe the return value + */ + +static wFont_p wlibSelectedFont(void) +{ + if (!fontInitted) { + fontInit(); + } + + return curFont; +} + +/** + * Get the default font size + * + * \return describe the return value + */ + +wFontSize_t wSelectedFontSize(void) +{ + if (!fontInitted) { + fontInit(); + } + +#if WLIB_FONT_DEBUG >= 3 + fprintf(stderr, "the font size of current font description is: %d\n", + pango_font_description_get_size(curFont->fontDescription)/PANGO_SCALE); + fprintf(stderr, "the font size of absoluteFontSize is: %d\n",absoluteFontSize); +#endif + return absoluteFontSize; +} + +/** + * Set the default font size + * + * \param size IN font size + * \return describe the return value + */ + +void wSetSelectedFontSize(int size) +{ + absoluteFontSize = (wFontSize_t)size; +} + +/** + * get the Pango font description as a string from a font definition. + * If the font definition is NULL, a default font is return. This is + * the current font if one is set. If not the first font from the font + * list is returned. + * + * \param fp IN the font definition + * \return the font description + */ + +const char *wlibFontTranslate(wFont_p fp) +{ + static gchar *fontName = NULL; + + if (fontName != NULL) { + g_free(fontName); + } + + if (!fontInitted) { + fontInit(); + } + + if (fp == NULL) { + fp = wlibSelectedFont(); + } + + if (fp == NULL) { + fp = standardFonts[0][FW_MEDIUM][FS_REGULAR]; + } + + fontName = pango_font_description_to_string(fp->fontDescription); +#if WLIB_FONT_DEBUG >= 2 + fprintf(stderr, "font translation: "); + fprintf(stderr, " \"%s\"\n", fontName); +#endif + return (const char *) fontName; +} + +/** + * Return description for one of the standard fonts + * + * \return + */ + +wFont_p wStandardFont(int face, wBool_t bold, wBool_t italic) +{ + if (!fontInitted) { + fontInit(); + } + + return standardFonts[face-F_TIMES][bold][italic]; +} |